401
| Years: 397 398 399 400 - 401 - 402 403 404 405 | |
| Decades: 370s 380s 390s - 400s - 410s 420s 430s | |
| Centuries: 4th century - 5th century - 6th century | |
Events:
- Pope Innocent I succeeds Pope Anastasius I.
- The Vandals start their westward trek from Dacia and Hungary (or 400).
- The Visigoths begin to attack the northernmost reaches of Italy, causing destruction in the countryside.
- Kumarajiva arrives in Changan.
- Theodosius II, East Roman Emperor.
- Aelia Eudocia, wife of Theodosius II
For Greece's 401 GSNA general military hospital of Athens, see Military of Greece.
For Ontario's Highway 401, see Macdonald-Cartier Freeway.